Healy, Karen
Palgrave Macmillan, 2005
Buku Teks
edited by Francis J. Turner
Free Press, 1968
Buku Teks
edited by Lynn Videka-Sherman and William J. Reid
NASW Press, 1990
Buku Teks
Martin, Ruben
Learning Matters, 2010
Buku Teks
edited by Jerrold R. Brandell
Free Press, 1997
Buku Teks